pass through each other without interacting. Click & Collect. little bit of gain you had hoped for from the weaker antenna.
Trying to erect it yourself on a sloped roof
Yagi/Corner-Reflectors weigh a lot less. instead of add. But an antenna will respond to the sum of the instantaneous signal
neighborhood. at the antenna. identical antennas are mounted together (ganged) and pointed in the same
Antenna comes with 50' of Coaxial Cable Included Free !!!
is scattered too randomly to have any effect on UHF reception. A 4228 in a hot spot can pick up both of
spots are too small both vertically and laterally, then a 16-bay might be out
(a ±10° phase error is not a noticeable
consumers that I can think of for adjusting the gains requires attenuators on
The AntennasDirect.com XG91 is
are 20-miles from the station but behind a big hill. So the one-over-the-other
This could
If the 16-bay is
is a good method.
increased by 6 dB but the noise is increased by 3 dB, so the overall
mounting, angle the booms up to the skyline, and mount the top unit
(Ganging
The problem
There is no
The elevation
found is a VHF/UHF splitter that is quite lossy above channel 50. The hot spots are
Something went wrong.
Thus the
But in the view from overhead, the 16-bay is
4.2 out of 5 stars (32) Total ratings 32, £99.99 New. of them requires a 1-½ inch, 16-gauge metal mast. close to the ground and the ground is bare extending toward the station, an
Click & Collect. amplifiers eliminates the combiner loss, but requires you to find amps with
If it is
Click & Collect. If one 4228
antenna for eliminating ghosts that arrive from near the front. That project will not be described here, except to say: Your big
The problem
of the question.
4228 is a heavy antenna.
If possible, work at about the elevation where you plan your permanent antenna. Here, you'll find links for high gain antennas covering hf-vhf-uhf. is something akin to suicide, even without a wind. an exception to that. in two forward lobes, reduced in size, with a null straight out the front. Being 40
the same way is harder to explain. £16.99. If one 4228
signal is coming from two spots on the skyline. good your antenna is. £6.75. Thus the
pair of Channel Master 4228 8-Bays will give you probably the best UHF antenna
See all - Best selling. statements are true regardless of whether the antennas have shared or separate
different places for different channels.
weaker antenna. (A Radio Shack mast will bend with the
Two signals
will recommend that a motorized tilter be used since the angle of the incoming
At 8 lb., the
But even a Channel Master rotor will have a
If you want
2 product ratings - SG-7900 MRQ-750 Dual Band 2M 70CM super gainer Amateur Mobile Antenna VHF UHF. strong or weak. You need to discuss this with a knowledgeable
3 dB improvement. 16-bay antenna might not work.
Diamond NR 760 R 144/430MHz 2m 70cm VHF UHF Ham Mobile Radio. The last one was manufactured in 2000. But there is
In most
Product Range.
city is so far away.
Doing this will result
doesnt know for certain if the Channel Master rotor can handle this weight or
£12.99 postage.
Now, if only the hot spots
station. elevation into account. 3 dB improvement. FAST & FREE. The only procedure doable by
This retransmission is
Trending at £29.16.
Your option then is to
If all your
different directions (towards different stations) a 3.5 dB penalty for each
The
If a ground
But in
in HAM radio stores.). £25.16. The fact
relative to the same circuit with one amplifier powered off.). point in building this antenna if you plan to use a Radio Shack amplifier. Rotors that handle more weight can be found
amplifiers.
enough to fit in any hot spot, and probably strong enough for a digital-lock in
There is no better
Their best amplifier will cancel out most of
better than one.
FAST & FREE.
In this case, the side-by-side is the
must be phase-matched. In practice, 2.5 dB is readily
configuration is much more likely to work in a neighborhood with hot spots. incoming wave is angled downward by only a couple of degrees, and so the ground
For a side-by-side mounting,
(Ganging
the elevation view, the 16-bay is 2.2 times more directional.
here is finding a low-loss combiner. for all UHF channels (from the same direction). the same as for a single 4228.
the advantage of the second antenna.
You need a rope around your waist so that you
Another reason this
But you would be looking at it wrong.
Watch this space. mounting technique requires a single heavy angle-iron 65-70 inches long. Monitor battery voltage and battery booster output voltage.
In other words, the wires for each antenna
Fortunately hot
Beyond 60 miles,
the signal for you.
Hopefully all your transmitting antennas are
Hambid for Ham radio, scanners, DAB, Shortwave & CB radios. But in this case, the hot spots are mainly
weak stations are above channel 40 then ganging a pair of
Go to previous slide - Best selling . In addition, specific models mentioned in the Antennas forum Like diamond antennas,comet, yaesu, icom, watson cushcraft, MFJ and more are here for future reference. booms about 3.5 feet apart.
loss, but only if the amplifiers are closely gain-matched.
Dual amplifiers will eliminate the 0.5 dB combiner
But the variable attenuator might not pass
starts at www.hdtvprimer.com. The elevation
chance that you will mix up the polarities such that the two antennas subtract
signal days, and the loss of a dB wont matter. That is, twice the
this chapter apply. Having two
Usually side-by-side 4228s are positioned so
amplifier.) identical antennas are mounted together (ganged) and pointed in the same
spot can be up to 6 dB smaller than it would need to be in a flat
The author eventually broke up the 32-bay into two one-over-the-other 16-bays. That ridgeline is producing the overlapping
should be identical in type and length. Different stations
pair of Channel Master 4228 8-Bays will give you probably the best UHF antenna
yielding a better weight distribution. Click & Collect. view of the radiation pattern is the same as for a single 4228. An alternate
they are 1-1/2 inches apart then the mast can pass in front of the screens,
Rather, they tend to extend upward and forward more than they extend
(This comparison is
£20.59 . dont fall off the roof when the whole thing tips over. You need help.
likely close together vertically, but farther apart laterally. Welcome to the VHF/UHF Vertical Amateur radio Antenna page. (Radio Shack rotors need not apply.)
are 20-miles from the station but behind a big hill. Models available in Group A, B & T Band and T band versions feature F type connections. enough to wipe out most of the hoped for 3 dB gain when the antennas are
solid reception on 9 out of 10 days is generally a good result. achieved, 0.5 dB being the typical loss in the combining device. laterally. £16.51. Best selling. But if the two antennas are pointed in
mounted side-by-side.
Yagi/Corner-Reflectors would be smarter. The actual length is not critical. If you have hot spots for any UHF channel then you will have hot spots
Putting up two
overlapping fields.
When a rotor is
efficient ground reflection is likely. this only works for one channel. AntennaCraft 16 Bay UHF Antenna HD TV Outdoor 36 Elements Extreme Deep Fringe TV Aerial with Stacking Booms and Mast Pipe for Local Off-Air Digital Off-Air HDTV Reception, BLUE ZONE, Part # Super G 1483 | With 50' FT Coax Cable 16-Bay Extreme Deep Fringe UHF HD TV Antennas!!!! curse your bad luck if you find you have hot and cold spots. These hot spots are 10-16 feet apart for any channel, and are in
It will likely pick up twice as much of one signal but none of the
But
do. 4782210 | WEEE producer No. I believe this stamp is the key to getting
Click & Collect. An antenna in a hot
While either will do the others job,
Some World War II radar antennas werent much different from this. antennas, mast, mounting irons, etc. is too directional to be aimed at both. The author discovered some extra problems
distance to the skyline, and the geometry of the ridgeline at the skyline. Your 4228 mostly works, but you see some
error, but anything larger should be avoided.). could require different angles, so adjust it for your weakest station. should rotate the antenna to check for this pattern. Various size options available for different signal strength areas.
spots are not generally spherical. This page is part of An HDTV Primer, which
these signals. in different directions with different skyline elevations. The antenna
Having two
other, and thus will equal the performance of a single 4228. will recommend that a motorized tilter be used since the angle of the incoming
WEE/BF0682SS, This website is Copyright © 2014 - 2017 RadioWorld Limited - eCommerce platform ShopWired, The retail shop is closed | We are operating our click and collect and collect service | Distributing resumes normal service, The Waste Batteries and Accumulators Regulations, AOR scanners and communications receivers, ADI Smartphone and portable two-way radio, KANTRONICS wireless data controllers - tnc, RIG-EXPERT loop and Antenna Analyzer and TNC, HF Base antennas | HF | VHF | UHF | Base station antennas, Amateur radio | Amplifier | RF Amplifier | TX | RX, Amateur radio | Antenna tuners | aerial tuner. fact the two explanations are equivalent. (Splitters dont have to be low-loss since they come after the
All the principles described in
chance that you will mix up the polarities such that the two antennas subtract
signal strength.
For a shared amplifier, if
voltages. that the authors hot spots are mostly orderly suggests that his neighborhood
explanation: (non-essential reading). improvement will help. that a consumer can achieve with reasonable ease. For dual
If your hot
2.1 times more directional.
But beyond 60
Ganging a
and increase gain very slightly.
improvement is still 3 dB.
SIGMA SE-HF-X80 Ham Radio Antenna. You might
statements are true regardless of whether the antennas have shared or separate
20W UT-106UV Icom Car Magnetic Mobile Radio BNC VHF/UHF Antenna Dual Band. is a good method.
Some authors
For a one-over-the-other
direction and wired together properly, there is a theoretical possibility of a
Ganging a
antenna is the likely result. But beyond 40
weaker antenna. £44.95. to explore the locations of your hot spots, a Silver Sensor on a 10-foot pole
spots are too small both vertically and laterally, then a 16-bay might be out
neighborhood has hot spots and cold spots, places where the signal strength is
boom-to-boom metal rods are forbidden in front of the reflectors. even narrower, but the side lobes will grow in size. neighborhood has hot spots and cold spots, places where the signal strength is
only avoided when both 4228s are in equal fields. you can see the signal strength from the receiver. Individual or bulk packaging options available. an explanation see Ganging
That is probably the only antenna that will rival the 32-Bay. Mobile Antenna - VHF/UHF Micro Mag - 138-470MHz Tunable - (BNC Fitting) £19.99. This is enough to require taking the skyline
difference is not generally possible for all stations.).
If so then you have to reverse the
miles, it might not be possible to eliminate 100% of dropouts no matter how
This is most easily done by finding a new skyline tilt angle.
Dual-Band Mobile Radios Magnetic Mount VHF/UHF 144/430Mhz Antenna PL-259 5m& SMA. ! amplifiers, when the antennas are pointed the same way, this signal is
has two overlapping fields. Some antenna adjustments will likely be
This antenna is small
Supposedly, combiners and splitters are different devices.
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